Tool assembly for injecting bone cement

Abstract

The utility model relates to a tool assembly for injecting bone cement, which is characterized in that an outer tube extends into a zygapophysis along the length direction of a vertebral pedicle, an inner tube with bone cement in a second channel extends into a first channel of the outer tube and extends to a part, needing to be injected with the bone cement, of the zygapophysis, a push rod extends into the second channel, and the push rod is pushed, so that the bone cement is injected into the zygapophysis. And the push rod pushes the bone cement in the second channel, so that the bone cement flows out along the liquid outlet hole. And under the action of the push rod, the bone cement flows out along the forming direction of the liquid outlet hole. One part of the bone cement permeates in the length direction perpendicular to the vertebral pedicle, and the other part of the bone cement permeates in the forming direction of the liquid outlet holes, so that the bone cement in the second channel permeates and disperses in the articular process in the forming direction of the liquid outlet holes; therefore, the bone cement from the vertebral body to the vertebral pedicle and finally to the articular process forms a three-in-one structure, so that the stability of the bone cement is enhanced.

Description

Technical Field

[0001] This utility model relates to the technical field of medical devices, and in particular to a tool assembly for injecting bone cement. Background Technology

[0002] Osteoporotic vertebral compression fractures with vertebral osteonecrosis (Kummell's disease) are very common among older adults.

[0003] In 1987, Galibert pioneered the use of percutaneous vertebroplasty to treat vertebral hemangiomas. Building upon percutaneous vertebroplasty (PVP), Reiley et al. designed a technique in 1994 to correct kyphoplasty using balloon dilation, known as percutaneous kyphoplasty, which was clinically applied in 1998. This technique involves percutaneously inserting a balloon into the vertebral body to create space for bone cement, thus reducing the pressure during injection and minimizing intraoperative leakage.

[0004] The current method involves simply injecting bone cement into the vertebral fissure of the injured vertebra using existing injection components. Because the bone cement only fills the fissure and does not form a fixed bond with the surrounding rigid anatomical structures, it is prone to loosening and displacement after surgery. This can lead to further collapse of the vertebral body, worsening of the patient's kyphosis, and even compression of the spinal cord nerves, resulting in paralysis.

[0005] The applicant discovered in clinical medicine that filling the vertebral body, pedicle, and articular processes with bone cement can create a three-in-one structure between the pedicle, articular processes, and bone cement within the vertebral body, thereby enhancing the stability of the bone cement and preventing postoperative loosening and displacement.

[0006] When bone cement is injected into the articular process, it needs to permeate radially along the injection instrument to create a fixed position and better fix the cement to the articular process. However, existing bone cement injection instruments consist of an outer tube, an inner tube containing bone cement, and a pusher to move the cement. The opening of the inner tube is along its axial direction. When bone cement is injected into the articular process, it can only be injected along the axial direction of the inner tube, making it difficult to permeate radially along the injection instrument. Utility Model Content

[0007] The purpose of this invention is to provide a tool assembly for injecting bone cement, in order to solve the problem that when bone cement is injected into articular processes using an outer tube, an inner tube, and a push rod, it is difficult for the bone cement to penetrate along the radial direction of the injection instrument.

[0008] According to one aspect of the present invention, a tool assembly for injecting bone cement is provided, the tool assembly for injecting bone cement comprising: an outer tube having a first channel extending through the outer tube;

[0009] The inner tube has a second channel inside, one end of which is connected to the outside and the other end is a closed end. A liquid outlet hole is opened on the circumferential surface of the inner tube near the closed end, and the liquid outlet hole is connected to the second channel.

[0010] The push rod has one end located inside the second channel;

[0011] Specifically, the push rod is pushed to cause the bone cement in the second channel to flow out from the outlet hole, thereby causing the bone cement to diffuse along the axis of the outlet hole.

[0012] In at least one embodiment of this application, the angle between the axis of the liquid outlet and the axis of the inner tube is α, satisfying the relationship: 30°≤α≤90°.

[0013] In at least one embodiment of this application, the liquid outlet is arranged perpendicular to the axis of the inner tube.

[0014] In at least one embodiment of this application, the axis of the liquid outlet is inclined toward the closed end.

[0015] In at least one embodiment of this application, the liquid outlet is located at the junction of the closed end and the circumferential surface of the inner tube.

[0016] In at least one embodiment of this application, there are two liquid outlet holes, which are opened at equal angles on the circumferential surface of the inner tube.

[0017] In at least one embodiment of this application, a connecting hole is provided at the end of the inner tube away from the closed end, one end of the connecting hole is connected to the outside, and the other end of the connecting hole is connected to the second channel.

[0018] In at least one embodiment of this application, one end of the outer tube is provided with a first hand-held portion, and the end of the inner tube away from the closed end is provided with a second hand-held portion, wherein the maximum diameter of the second hand-held portion is greater than the diameter of the first channel.

[0019] In at least one embodiment of this application, one end of the push rod is provided with a third hand-held part, the third hand-held part is located at the end away from the inner tube, and the maximum diameter of the third hand-held part is greater than the diameter of the second channel.

[0020] In at least one embodiment of this application, the length of the outer tube is denoted as a, the length of the inner tube is denoted as b, and the length of the push rod is denoted as c, satisfying the relationship: c > b > a.

[0021] Implementing the embodiments of this utility model will have the following beneficial effects:

[0022] In this embodiment, the tool assembly for injecting bone cement is used by extending the outer tube along the length of the pedicle into the articular process. The inner tube containing bone cement in the second channel is inserted into the first channel of the outer tube and extended to the part of the articular process where bone cement needs to be injected. The push rod is then inserted into the second channel and pushed to push the bone cement in the second channel so that the bone cement flows out through the outlet hole.

[0023] Because the outlet is located on the circumference of the inner tube near the closed end, the bone cement flows out along the direction of the outlet under the action of the push rod. A portion of the bone cement permeates along the length perpendicular to the pedicle, while another portion permeates along the direction of the outlet. This allows the bone cement in the second channel to permeate and diffuse within the articular process through the outlet, forming a three-dimensional structure from the vertebral body to the pedicle and finally to the articular process. This enhances the stability of the bone cement and prevents loosening or displacement of the bone cement within the vertebral body, which could lead to vertebral collapse. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the tool assembly for injecting bone cement according to an embodiment of the present invention;

[0026] Figure 2 for Figure 1 An exploded view of the tool components used for injecting bone cement.

[0027] Figure 3 for Figure 1 A cross-sectional view of the tooling components used for injecting bone cement;

[0028] Figure 4 This is a cross-sectional view of the inner tube according to another embodiment of the present invention;

[0029] Figure 5 This is a cross-sectional view of the inner tube of another embodiment of the present invention;

[0030] Figure 6 This is a reference diagram showing the tool components for injecting bone cement according to this utility model.

[0031] Among them: 100, tool components for injecting bone cement;

[0032] 110. Outer tube; 110a. First channel; 111. First handheld part;

[0033] 120. Inner tube; 120a. Second channel; 120b. Closed end; 120c. Liquid outlet; 120d. Connecting hole; 121. Second handle;

[0034] 130. Push rod; 131. Third hand part. Detailed Implementation

[0035] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0036] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0038] According to one aspect of the present invention, a tool assembly 100 for injecting bone cement is provided, the tool assembly 100 for injecting bone cement includes: an outer tube 110, and a first channel 110a extending through the outer tube 110;

[0039] The inner tube 120 has a second channel 120a inside, one end of which is connected to the outside and the other end is a closed end 120b. The inner tube 120 has a liquid outlet hole 120c on its circumferential surface near the closed end 120b. The liquid outlet hole 120c is connected to the second channel 120a.

[0040] Push rod 130, one end of which is located in the second channel 120a;

[0041] Specifically, the push rod 130 is pushed to cause the bone cement in the second channel 120a to flow out from the outlet hole 120c, so that the bone cement diffuses along the axis of the outlet hole 120c.

[0042] Please refer to Figures 1-3 In this embodiment, during use, the outer tube 110 is extended into the articular process along the length of the pedicle. The inner tube 120, containing bone cement, is inserted into the first channel 110a of the outer tube 110 and extended to the area of ​​the articular process where bone cement needs to be injected. The push rod 130 is then inserted into the second channel 120a and pushed, causing the bone cement in the second channel 120a to flow out along the outlet hole 120c. Since the outlet hole 120c is located on the circumferential surface of the inner tube 120 near the closed end 120b, the bone cement will flow out along the opening direction of the outlet hole 120c under the action of the push rod 130. A portion of the bone cement permeates along the length direction perpendicular to the pedicle, while another portion permeates within the articular process along the opening direction of the outlet hole 120c. This allows the bone cement in the second channel 120a to permeate and diffuse within the articular process through the opening direction of the outlet hole 120c, forming a three-in-one structure from the vertebral body to the pedicle and finally to the articular process. This enhances the stability of the bone cement and prevents loosening or displacement of the bone cement within the vertebral body, which could lead to collapse of the vertebral body height.

[0043] It should be noted that after filling the vertebral body with existing tools, the tool assembly 100 for injecting bone cement in this embodiment can use the outer tube 110 of existing tools, and the inner tube 120 and push rod 130 of the tool assembly for injecting bone cement in this embodiment.

[0044] It should be further explained that the outer tube 110 is generally a long, cylindrical tube open at both ends, and the first channel 110a is a circular through channel; the inner tube 120 is generally a long, cylindrical tube open at one end and closed at the other end, the second channel 120a is a circular through channel, and the liquid outlet 120c is a through hole, which is a circular hole in this embodiment, but can be a strip-shaped hole or a triangular hole in other embodiments, including but not limited to the above shapes; the push rod 130 is a long, cylindrical rod.

[0045] It should be noted that when using existing bone cement injection tools to inject bone cement into the vertebral body, when the bone cement is injected to the articular process, the tool component 100 for injecting bone cement in this solution is replaced, and the outer tube 110 can be the outer tube 110 of the existing bone cement injection tool.

[0046] The end of the outer tube 110 is moved to the articular process. The inner tube 120, containing bone cement in the second channel 120a, is inserted into the first channel 110a of the outer tube 110 and extended to the area of ​​the articular process where bone cement needs to be injected. The push rod 130 is inserted into the second channel 120a and pushed, causing the push rod 130 to push the bone cement in the second channel 120a, so that the bone cement flows out along the outlet hole 120c. Since the outlet hole 120c is located on the circumferential surface of the inner tube 120 near the closed end 120b, the bone cement will flow out along the opening direction of the outlet hole 120c under the action of the push rod 130, so as to continuously inject bone cement into the articular process.

[0047] Ultimately, the bone cement forms a three-in-one structure from the vertebral body to the two pedicles and then to the two articular processes, thereby enhancing the stability of the bone cement and preventing displacement caused by loosening of the bone cement due to the patient's daily activities after surgery.

[0048] It should be further explained that after surgery, the bone cement injected using this method forms a "T"-shaped structure or a "screw cap" structure at the joint between the articular process and the pedicle (at the articular process), thereby increasing the adhesion of the bone cement to the vertebral body, reducing the difficulty of the surgery, and making the surgery easier to perform.

[0049] Secondly, the articular processes are the posterior column structures of the spine, with strong rigidity. The bone cement of the two articular processes forms a three-in-one structure with the bone cement in the vertebral body through the bone cement of the two pedicles, which makes the stability even stronger.

[0050] The "T"-shaped bone cement structure formed at the articular processes allows the bone cement within the vertebral body to be strongly anchored to the articular processes through the pedicles, forming a structure similar to the cap of a screw, thereby reducing the incidence of bone cement displacement within the vertebral body.

[0051] At the same time, it reduces the difficulty of surgery, shortens the surgical learning curve, reduces surgical time, and improves surgical efficiency.

[0052] It should be further explained that the puncture direction is along the articular process to the pedicle and then to the vertebral body. After puncture, the direction of bone cement injection is along the vertebral body to the pedicle and finally to the articular process. Only the bone cement in the articular process portion uses the tool component 100 for injecting bone cement in this embodiment.

[0053] In at least one embodiment of this application, the angle between the axis of the liquid outlet 120c and the axis of the inner tube 120 is α, satisfying the relationship: 30°≤α≤90°.

[0054] Please refer to Figures 1-6 In this embodiment, the angle between the axis of the outlet hole 120c and the axis of the inner tube 120 is α, and satisfies the relationship: 30°≤α≤90°. That is, the angle between the axis of the outlet hole 120c and the axis of the second channel 120a is α.

[0055] Since the angle between the axis of the outlet hole 120c and the axis of the inner tube 120 is in the range of 30° to 90°, when the push rod 130 is pushed to squeeze the bone cement in the second channel 120a, the component force of the push rod 130 acting on the bone cement will make the bone cement better discharged through the outlet hole 120c.

[0056] It should be noted that if the outlet hole 120c is set on the end face of the closed end 120b, the force of the push rod 130 will act directly on the bone cement, causing the bone cement to directly reach the articular process through the end of the outer tube 110, and will not permeate along the axis perpendicular to the second channel 120a. As a result, the bone cement cannot form a firm connection with the bone cement in the spinal vertebral body.

[0057] By setting the axis of the outlet hole 120c at an angle to the axis of the second channel 120a, the push rod 130 pushes the bone cement in the second channel 120a of the inner tube 120. The push rod 130 pushes the bone cement out along the direction of the outlet hole 120c, which can better control the flow direction of the bone cement. This allows the bone cement to penetrate more along the length direction perpendicular to the articular process (i.e., along the axis perpendicular to the outer tube 110), thus forming a "T"-shaped or "screw cap" structure (at the articular process). This provides better fixation for the bone cement and avoids problems of loosening or displacement of the bone cement due to exercise or daily spinal rotation after surgery.

[0058] Preferably, the angle between the axis of the outlet hole 120c and the axis of the inner tube 120 is 30°, and the axis of the outlet hole 120c is inclined towards the closed end 120b. At this time, the component of the force of the push rod 130 will act along the axis of the outlet hole 120c, so that the bone cement can flow out better and avoid affecting the control of the injection volume due to excessive force.

[0059] It should be noted that if the angle is less than 30°, it will be difficult to machine a hole with an angle less than 30° on the circumference of the inner tube 120 during the machining process.

[0060] If the angle is greater than 90°, the pushing force needs to be greater, making it difficult to control the pushing force.

[0061] In at least one embodiment of this application, the liquid outlet 120c is arranged perpendicular to the axis of the inner tube 120.

[0062] Please refer to Figures 1-6 In one embodiment, the axis of the outlet hole 120c is set perpendicular to the axis of the inner tube 120. During the process of pushing the push rod 130, the force generated by the push rod 130 acts directly along the axial direction of the inner tube 120. When the force reaches the closed end 120b, the bone cement is squeezed out of the outlet hole 120c by the squeezing force.

[0063] It should be noted that when the outlet hole 120c is set perpendicular to the axis of the inner tube 120 or the angle exceeds 90 degrees, a larger force is required to extrude the bone cement.

[0064] In at least one embodiment of this application, the axis of the liquid outlet 120c is inclined toward the closed end 120b.

[0065] Please refer to Figures 1-6 In this embodiment, the axis of the outlet hole 120c is inclined towards the closed end 120b, so that when the push rod 130 is pushed, the component of the force will act along the axis of the outlet hole 120c, thereby making the push rod 130 more effective and allowing the injection of bone cement to be completed with a smaller force.

[0066] Secondly, by tilting the axial direction of the outlet hole 120c towards the closed end 120b, the bone cement flowing out through the outlet hole 120c will permeate along the axial direction of the outlet hole 120c, forming a "T" shaped structure or a "screw cap" structure (at the articular process) relative to the bone cement in the vertebral body of the spine, making the overall bone cement more stable and the fixation effect better.

[0067] In another embodiment, the axis of the outlet hole 120c can be tilted away from the closed end 120b. However, this method results in a large pushing force of the push rod 130, making it difficult to control the amount of bone cement injected.

[0068] In at least one embodiment of this application, the liquid outlet 120c is located at the junction of the closed end 120b and the circumferential surface of the inner tube 120.

[0069] In at least one embodiment of this application, there are two liquid outlet holes 120c, and the two liquid outlet holes 120c are opened at equal angles on the circumferential surface of the inner tube 120.

[0070] Please refer to Figures 1-6 Preferably, the liquid outlet 120c is located at the junction of the closed end 120b and the circumferential surface of the inner tube 120, and the angle between the axis of the liquid outlet 120c and the axis of the second channel 120a of the inner tube 120 is 30°.

[0071] Because the outlet hole 120c is located at the junction of the closed end 120b and the circumference of the inner tube 120, and because the outlet hole 120c is connected to the second channel 120a, the force exerted on the bone cement by the push rod 130 is partly applied directly to the closed end 120b, and partly applied directly along the direction of the outlet hole 120c. Since the outlet hole 120c is located at the junction of the closed end 120b and the circumference of the inner tube 120, the outflow of bone cement is smoother, preventing blockages or delays.

[0072] When bone cement flows out, the two drainage holes 120c allow for more fixation points and more even force distribution, resulting in better fixation. Postoperatively, because bone cement is injected into both drainage holes 120c in opposite directions, the two portions of bone cement form a more stable, three-dimensional "T"-shaped structure or "screw cap" structure (at the articular process), preventing postoperative loosening and displacement. Furthermore, the two sides of bone cement also distribute postoperative force, preventing excessive force from affecting fixation.

[0073] In other embodiments, the number of liquid outlet holes 120c can be multiple.

[0074] In at least one embodiment of this application, the inner tube 120 has a connecting hole 120d at one end away from the closed end 120b, one end of the connecting hole 120d is connected to the outside, and the other end of the connecting hole 120d is connected to the second channel 120a.

[0075] In at least one embodiment of this application, the outer tube 110 is provided with a first hand-held part 111 at one end, and the inner tube 120 is provided with a second hand-held part 121 at one end away from the closed end 120b, wherein the maximum diameter of the second hand-held part 121 is greater than the diameter of the first channel 110a.

[0076] In at least one embodiment of this application, one end of the push rod 130 is provided with a third hand-held part 131, the third hand-held part 131 is located at the end away from the inner tube 120, and the maximum diameter of the third hand-held part 131 is greater than the diameter of the second channel 120a.

[0077] Please refer to Figures 1-6In this embodiment, after filling the vertebral body with an existing bone cement injection assembly, the first hand-held part 111 is moved to fix one end of the outer tube 110 into the patient's body to the position in the articular process where bone cement needs to be filled. The closed end 120b of the inner tube 120 is inserted into the first channel 110a and passes through the first channel 110a to the position where bone cement needs to be filled (e.g., the articular process).

[0078] Then, the push rod 130 is inserted into the second channel 120a through the connecting hole 120d. The doctor fixes the second handpiece 121 with his hand and pushes the third handpiece 131, thereby moving the push rod 130 within the second channel 120a to push the bone cement in the second channel 120a towards the closed end 120b. At this time, the bone cement flows out from the outlet hole 120c at the junction of the closed end 120b and the circumference of the inner tube 120, and permeates along the axial direction of the outlet hole 120c to complete the filling of bone cement inside the articular processes. This allows the bone cement in the two articular processes and the bone cement in the vertebral body to form a more stable three-in-one "T"-shaped structure or "screw cap" structure (at the articular processes), so as to avoid the bone cement from loosening and displacing easily after surgery. Secondly, the bone cement on both sides can also disperse the postoperative force, avoiding excessive force that may affect the fixation of the bone cement.

[0079] Since the maximum diameter of the second hand grip 121 is greater than the diameter of the first channel 110a, the second hand grip 121 can play a limiting role to prevent the inner tube 120 from extending too far in.

[0080] The maximum diameter of the third hand-held part 131 is greater than the diameter of the second channel 120a. After the push rod 130 is pushed, the third hand-held part 131 can abut against the end of the inner tube 120 away from the closed end 120b, thereby indicating that the push rod 130 continues to move, so as to play a limiting role.

[0081] In at least one embodiment of this application, the length of the outer tube 110 is denoted as a, the length of the inner tube 120 is denoted as b, and the length of the push rod 130 is denoted as c, satisfying the relationship: c > b > a.

[0082] Please refer to Figures 1-6 In this embodiment, the length of the outer tube 110 is denoted as a, the length of the inner tube 120 is denoted as b, and the length of the push rod 130 is denoted as c, satisfying the relationship: c > b > a. The length of the inner tube 120 is greater than the length of the outer tube 110, so that the inner tube 120 can penetrate through the first channel 110a to the position where bone cement needs to be filled. The length of the push rod 130 is greater than the length of the inner tube 120, so that the push rod 130 can completely push out the bone cement in the second channel 120a of the inner tube 120, so as to realize the filling of the position where bone cement needs to be filled.

[0083] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A tool assembly for injecting bone cement, characterized in that, The tooling components for injecting bone cement include: The outer tube has a first channel that penetrates through it; The inner tube has a second channel inside, one end of which is connected to the outside and the other end is a closed end. A liquid outlet hole is opened on the circumferential surface of the inner tube near the closed end, and the liquid outlet hole is connected to the second channel. The push rod has one end located inside the second channel; Specifically, the push rod is pushed to cause the bone cement in the second channel to flow out from the outlet hole, thereby causing the bone cement to diffuse along the axis of the outlet hole.

2. The tool assembly for injecting bone cement according to claim 1, characterized in that, The angle between the axis of the liquid outlet and the axis of the inner tube is α, which satisfies the relationship: 30°≤α≤90°.

3. The tool assembly for injecting bone cement according to claim 2, characterized in that, The liquid outlet is perpendicular to the axis of the inner tube.

4. The tool assembly for injecting bone cement according to claim 2, characterized in that, The axis of the liquid outlet is inclined toward the closed end.

5. The tool assembly for injecting bone cement according to claim 1, characterized in that, The liquid outlet is located at the junction of the closed end and the circumference of the inner tube.

6. The tool assembly for injecting bone cement according to claim 1, characterized in that, There are two liquid outlet holes, which are opened at equal angles on the circumference of the inner tube.

7. The tool assembly for injecting bone cement according to claim 6, characterized in that, The inner tube has a connecting hole at one end away from the closed end. One end of the connecting hole is connected to the outside, and the other end of the connecting hole is connected to the second channel.

8. The tool assembly for injecting bone cement according to claim 1, characterized in that, The outer tube has a first hand-held part at one end, and the inner tube has a second hand-held part at the end away from the closed end. The maximum diameter of the second hand-held part is greater than the diameter of the first channel.

9. The tool assembly for injecting bone cement according to claim 8, characterized in that, One end of the push rod is provided with a third hand-held part, which is located at the end away from the inner tube, and the maximum diameter of the third hand-held part is greater than the diameter of the second channel.

10. The tool assembly for injecting bone cement according to claim 1, characterized in that, The length of the outer tube is denoted as a, the length of the inner tube as b, and the length of the push rod as c, satisfying the relationship: c > b > a.

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